Guide to tyre management and maintenance on heavy vehicles

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Guide to tyre management and maintenance on heavy vehicles
Revised December 2020

Guide to tyre
management and
maintenance on
heavy vehicles
Guide to tyre management and maintenance on heavy vehicles
Guide to tyre management and maintenance on heavy vehicles

                 Foreword
                 Tyres are too often neglected or
                 abused. As a vital element of vehicle
                 roadworthiness, they deserve
                 particular attention. And yet, the
                 condition of tyres has overtaken
                 braking systems as the most
                 common defect found on heavy
                 goods vehicles and trailers at the
                 roadside. Tyres also vie for the top
                 spot on bus and coach checks.
                 All operators are legally responsible
                 for maintaining vehicles and trailers
                 in a fit and serviceable condition.
                 The Traffic Commissioners have
                 regulatory powers over Licensed
                 operators. Drivers also have a clear
                 legal responsibility as the users of
                 vehicles. Operators must establish an
                 appropriate system of preventative
                 maintenance inspections and driver
                 daily walk round checks. Traffic
                 commissioners expect to see the likely risks assessed in line
                 with your business and systems designed to address those risks,
                 particularly where vehicles operate off-road.
                 This comprehensive guide and the companion drivers’ poster
                 provide authoritative practical advice expressing the standard
                 of professionalism expected of operators with regard to their
                 tyres. Traffic Commissioners welcome it and commend it to all
                 operators of heavy commercial vehicles.

                 Kevin Rooney & Sarah Bell
                 on behalf of the Traffic Commissioners
                 for Great Britain

2
Guide to tyre management and maintenance on heavy vehicles
Contents
1. Introduction                     4
2. Tyre Management System           5
3. Tyre Choice and Fitting          6
4. Tyres In Service                 9
5. Tyre Repairs                    15
6. Regrooving                      16
7. Retreading                      17
8. Tyre Storage                    18
9. Wheels                          18
10. Training                       18
11. Acknowledgements               20
12. Useful Contacts                20

                                        3
Guide to tyre management and maintenance on heavy vehicles
Guide to tyre management and maintenance on heavy vehicles

                 1. Introduction
                 This guide contains essential information necessary to
                 the safe and efficient management of tyres fitted to
                 heavy vehicles: trucks, trailers, buses and coaches. It is
                 addressed to vehicle operators in the UK and reflects UK
                 regulations and operating conditions. The guidance may
                 not be applicable in countries outside the UK. Equally, not
                 all the advice may be applicable to specialist vehicles such
                 as cranes or mobile plant.
                 Tyres are a safety critical element of every vehicle on the
                 road. They are also one of the most highly regulated
                 automotive components. Tyre manufacturers exercise
                 great care in producing safe, reliable and compliant
                 products. However, the vehicle operator is responsible for
                 the tyre’s in-service condition. This responsibility is backed
                 by legal obligations concerning not only the condition of
                 the tyre but also the processes and procedures in place to
                 ensure that tyres in use are fit for purpose at all times.

4
Guide to tyre management and maintenance on heavy vehicles
2. Tyre Management System
A robust tyre management system is essential     • That the location of trailers is tracked and
for any professional vehicle operator and          the particular issues of inspecting and
should ensure:                                     maintaining remote assets are addressed.
                                                   Specific attention should be given to the
• That tyres in service are appropriate to the
                                                   condition of tyres on little-used trailers,
  vehicle and operating conditions;
                                                   mobile plant, etc.
• That all tyre pressures are checked monthly
                                                 • That a vehicle-specific tyre inflation
  or at least at the same inspection frequency
                                                   pressure policy is established and
  as declared on the Operator licence, at
                                                   periodically reviewed in light of operating
  ambient temperature with a calibrated
                                                   experience;
  gauge;
                                                 • That processes exist to distribute best
• That responsibility for regularly checking,
                                                   practice in tyre management throughout
  reporting and maintaining tyre pressure
                                                   the fleet;
  to policy is explicitly defined between the
  vehicle lessor, lessee, maintenance garage,    • That staff dealing with tyre management
  operator, etc., as applicable;                   are properly trained and empowered to act
                                                   with sufficient authority;
• That personnel responsible for tyre pressure
  maintenance have access to an airline          • That any technician dealing with tyre
  capable of inflating a tyre to the highest       inspections or repairs is properly trained
  pressure in the tyre inflation policy;           and qualified;
• That vehicle tyres are regularly and           • That drivers are properly trained and
  closely examined for damage and wear             equipped to recognise and report tyre
  with mechanisms in place to address any          issues;
  identified issues;
                                                 • That any on-site tyres are properly stored.
• That tyre age is monitored and tyres fitted
                                                 Should you identify any discrepancies or
  to the front steering axle are no more than
                                                 shortcomings between the contents of this
  10 years old;
                                                 guide and your internal procedures you must
                                                 address them immediately.

                                                                                                  5
Guide to tyre management and maintenance on heavy vehicles
Guide to tyre management and maintenance on heavy vehicles

    3. Tyre Choice and Fitting
    APPLICABLE REGULATIONS                             BASIC PRINCIPLES
    Tyres are subject to extensive European and        Briefly, the requirements of a tyre are:
    International regulations. Compliance is
                                                       • To support the maximum authorised load
    verified at type approval. It is illegal to sell
                                                         at the vehicle’s legal maximum speed;
    tyres in the UK without the required type
    approval marking (“E-mark”) on the sidewall.       • To grip the road for control of the vehicle
                                                         in all conditions;
    UK Construction and Use Regulation 27
    require that tyres fitted on the same axle         • To give the best possible ride and longevity
    are of the same size and construction (radial,       subject to the two criteria above.
    cross-ply, etc) and that the load index and        A tyre is defined by the following
    speed symbol must at least match the vehicle       characteristics:
    plated weight and the maximum legally
    permissible speed for the vehicle.                 • Size designation comprising section width,
                                                         aspect ratio and rim diameter;
                                                       • Construction — normally radial but less
    RECOGNISED GUIDANCE                                  frequently cross ply or bias belted;
    BS AU 50-2.7b: 2017 Code of practice for the       • Type of tread pattern according to
    selection and care of tyres and wheels for           individual manufacturer’s designation;
    commercial vehicles.
                                                       • Load index and speed symbol (service
    Recommendations published by the                     description).
    European Tyre and Rim Technical
    Organisation (ETRTO) cover many aspects of         The operator must ensure that tyres are
    tyre specification, use and management.            responsibly sourced and endorsed for UK
                                                       and European use. Any tyre chosen as a
                                                       replacement should normally be of the same
                                                       size, construction, and service description
                                                       as the original equipment. Particular care
                                                       must be taken to ensure that the tyre load
                                                       capacity is equal to or greater than the axle
                                                       plated weight. Prior written approval is now
                                                       required from the vehicle manufacturer
                                                       before using a tyre with a different
                                                       specification from the vehicle’s original
                                                       equipment.

6
Guide to tyre management and maintenance on heavy vehicles
9

                                                     3                     4
                                      2
                                                                                             5
                   1                                                                       156/ 6 7
                                                  LOAD RANGE  L                                150
                                                          L CO
                                                      PLY STEE       RD          10                L 15
                                    14 SIDEWAATL9L001 KPA (130 PSI) COLD                            15 4M 8
                           C
                                ES
                            OD ORD (8820 LBS) 860 KPA (125 PSI) COLD           E 4 00026146           0
                         A     C     S      ) AT                                   2566
                      AD EEL 00 KG 390 LBS                                                7S
                   AN LY ST LE 40 KGS (7
                A C 5 P SING 3350
                                                                                             2R2
                                                                                                             RE
              US EAD OAD DUAL                                                                                  GR 13
               TR L
                  X    AD                                                                           DO
                MA X LO
                 MA                                                                                   TX         O
                                                                                                        X12
                                                                                                          XX

                                                                                                              OV
                                                                                                             X

                                                                                                                AB
                                                                                                                  XX

                                                                                                                  LE
                                                                                                                    XX
                                                                                                                   11

                                                                                                                      XX
                                                                                                                        X
PRINCIPAL TYRE MARKINGS
1   Tyre Section width                               7   Speed symbol                                11   Manufacturing date code
2   Aspect ratio                                     8   Additional service                          12   DOT manufacturing
3   Construction (R=radial)                              description / Unique point                       site code
4   Rim diameter (inches)                            9   Location of tread                           13   Regroovable tyre
                                                         wear indicator                              14   Data not applicable to
5   Load Index (single tyre)
                                                    10   Approval numbers                                 European markets
6   Load Index (dual mounted)

TYRE CHOICE                                                                    size, service description and wear are
                                                                               twinned together. The difference between
Steering axle: It is generally not
                                                                               the remaining tread pattern depths on
recommended to fit tyres designated for
                                                                               twinned tyres should not generally be
drive axle use on the steering axle of a
                                                                               greater than 4mm at the same stage of tyre
vehicle as the handling may be adversely
                                                                               life (i.e. new, regrooved or retreaded). It is
affected. It is strongly recommended that
                                                                               not recommended to twin regrooved tyres
only new tyres or re-grooved new tyres
                                                                               with un-regrooved tyres. Equally, twinning
should be fitted to steering axles and this is
                                                                               different brands of tyre is not recommended
a requirement of Tempo 100 certification.
                                                                               as casing characteristics may differ, possibly
On rear/ drive axles care should be taken                                      causing accelerated wear to one tyre.
to ensure that only tyres of the same type,

                                                                                                                                    7
Guide to tyre management and maintenance on heavy vehicles
Guide to tyre management and maintenance on heavy vehicles

    Winter use: Historically, tyres offering          stretched, or damaged. Care must also be
    improved winter mobility have been marked         taken when removing a tyre from the rim not
    “M + S”. This reflected the manufacturer’s        to damage the bead area or casing plies in
    assessment of the tyre’s performance              any way.
    on snow. More recently the snow grip
                                                      If circumstances permit it is preferable to
    pictogram (Alpine or 3PMSF symbol)
                                                      remove the wheel from the vehicle before
    has been introduced. This
                                                      replacing the tyre. This will enable both the
    identifies that the tyre meets an
                                                      condition of the wheel rim and the correct
    objective performance standard
                                                      fitting of the tyre to be thoroughly checked.
    contributing to improved
                                                      It will also reduce the risk of working on a
    winter mobility.
                                                      jacked and propped vehicle.
    Rolling resistance: Tyres account for 20-30%
    of the fuel consumption and CO2 emissions
    of a heavy commercial vehicle. In order to        DIRECTIONAL TYRES
    reduce their environmental impact many new        Directional tread patterns allow optimised
    vehicles are fitted with low rolling resistance   tread wear performance. The use of a
    tyres. To maintain this performance               directional tyre in the opposite direction does
    replacement tyres should be of the same           not constitute an unsafe condition: although
    rolling resistance class as the original          not optimal, performance and handling
    equipment.                                        will not be compromised. If a directional
    Many passenger carrying vehicle (PCV)             tyre shows an irregular wear profile, (for
    operators will have to register Local Service     example, a sloped wear pattern) it may be
    Buses with the Traffic Commissioner. In those     turned on the rim and run in the opposite
    cases, the vehicles can be fitted with “J”        direction with no detriment to other
    speed rated tyres, limited to a maximum           performance criteria.
    speed of 100 km/h. This enables the fitment       In such cases, it is recommended that all tyres
    of especially robust urban bus tyres.             on the same axle should be turned on the rim
                                                      so that all rotational arrow markings face in
                                                      the same direction. When turning these tyres
    FITTING                                           on the rim or moving them from side to side
    Tyres should only be fitted by suitably           on a vehicle, they should be treated in all
    qualified personnel using appropriate             other respects in the same way as any other
    equipment and following correct procedures.       tyre.
    Correct tyre fitting will ensure that the tyre
    is mounted concentrically on the rim and
    that the bead area has not been distorted,

8
Guide to tyre management and maintenance on heavy vehicles
4. Tyres in Service
                                                           75% of Tread Width
APPLICABLE REGULATIONS
Construction and Use Regulation 27 requires
that a tyre shall be suitable to its application
and correctly inflated. The regulation also
specifies limits to acceptable damage and
the minimum requirements regarding tread                    1.0mm Minimum
depth.                                                      Pattern must be visible
Tread depth on heavy vehicles must not
be less than 1mm at any point across a                                   75% of Tread Width
continuous band covering at least 75% of the
width of the tread around the circumference
of the tyre. (The minimum depth for vehicles
up to 3.5 Tonnes GVW is 1.6mm). The tread
pattern must also be visible across the
remainder of the tread. For this purpose, the                              1.0mm Minimum
measurement area of the tread is in contact                          Pattern must be visible
with the road surface when the tyre is
correctly inflated and under normal use.                         75% of Tread Width

RECOGNISED GUIDANCE
Detailed guidance regarding in-service
issues is contained in the recommendations
                                                                   1.0mm Minimum
published by ETRTO.
                                                                Pattern must be visible

IRREGULAR TREAD WEAR                               cornering and roundabouts on UK roads,
Tyre wear should be checked frequently             misalignment or sometimes, under inflation.
because once a wear pattern becomes firmly         Equally, drive axle tyres frequently wear
established it becomes difficult to stop, even     faster on the inner edge of the inner tyres.
if the underlying cause is corrected.              Turning the tyre on the rim, if carried out
                                                   at the correct time, can considerably extend
Tyres on steering axles, particularly on the       tyre life and provide cost savings. A tyre
nearside, often wear more on one shoulder          should be turned on the rim early enough to
than the other. This can be due to the road        equalise the wear. A difference greater than
camber, the continuous                             3mm from one shoulder to the other should
                                                   instigate a turn on rim.

                                                                                                  9
Guide to tyre management and maintenance on heavy vehicles
Guide to tyre management and maintenance on heavy vehicles

     SIDEWALL ABRASION                                          To demonstrate legal compliance the size
                                                                and service description markings must be
     When the sidewall lettering (or sidewall wear
                                                                legible on at least one side of the tyre.
     indicator, if applicable) starts to disappear,
                                                                Tyres with severe kerbing damage must be
     the vehicle operator should turn the tyre
                                                                removed from service: it is illegal for the
     on the rim or move it to a less aggressive
                                                                reinforcement plies to be exposed.
     position on the vehicle so that the worn
     sidewall is protected from further damage.

       Type of                         Shoulder wear -
                    Centre wear                             One-sided wear       Diagonal wear           Flat spots
        wear                             both sides

     Cause       Over inflation       Under-inflation      1. Excessive toe     1. Mis-mounting      Excessive sharp
                 or incorrect         or incorrect         2. Excessive            of tyre and       braking.
                 matching of tyres    matching of tyres       camber               wheel assembly    Brakes locking,
                 and rims. May        and rims.            3. Non parallel         to trailer        for example as a
                 also occur on high                           axles             2. Mis-matched       result of incorrect
                 torque drive axle                         4. Bent axle            twins             adjustment of
                 applications.                             5. Non – uniform     3. High speed        trailer brake
                                                              tyre and wheel       empty running     controls or
                                                              assembly          4. Improper          defective brakes.
                                                           6. Severe               bearing
                                                              operating            adjustment
                                                              conditions.       5. Toe out.

     Correction Adjust pressure       Adjust pressure      Identify and         Identify and         Avoid harsh
                to the                to the               correct mechanical   correct mechanical   braking. Check
                recommended           recommended          defect. If wear      defect. If wear      brakes and
                level for the         level for the        is not too severe    is not too severe    braking system
                particular tyre       particular tyre      turn tyre on rim.    turn tyre on rim.    and correct any
                location and load.    location and load.                                             malfunction.

10
20
                                                                                                                                           80% INFLATION
                                                                                                                        0
                                                                                                                            120 100% INFLATION    80    70        60   50   40   30
                                                                                                                                           % Inflation Pressure

WHEEL ALIGNMENT                                                                                                       110
It is important that a vehicle’s wheels are

                                                                                % Fuel Consumption (constant speed)
                                                                                                                      108
correctly aligned. Poor alignment will affect:
                                                                                                                      106
• Tyre wear
• Vehicle handling                                                                                                    104
                                                                                                                              3% MORE FUEL USED
• Fuel economy
                                                                                                                      102
TOE-OUT:
inside                                                                                                                100
                                                                                                                            100          20% UNDER INFLATION                     55
shoulders                                                                                                                                  % Inflation Pressure

TOE-IN:
outside
shoulders                                                                      Optimal inflation pressure is influenced by
                                                                               operating conditions (load, speed, etc) and
                                                                               vehicle and tyre characteristics. The vehicle
CORRECT INFLATION                                                              operator should procure and follow the
                                                                               specific pressure recommendations provided
The maintenance of correct tyre pressures
                                                                               by the tyre manufacturer for the vehicle type
is extremely important, not only from the
                                                                               and application.
performance and safety aspects but also
from the tyre life point of view. Furthermore,                                 Tyre pressures should be checked when the
correct tyre pressures produce the best ride                                   tyre is at ambient temperature. Tyre inflation
and handling of the vehicle.                                                   equipment should be regularly calibrated in
                                                                               line with the manufacturer’s guidelines.
Under-inflation can seriously reduce tyre
service life and increase fuel consumption:                                    The valve cap is the primary air seal and
                                                                               must always be fitted (the valve allows the
                                                                               tyre to be inflated and deflated; it should
               120
                                                                               not be treated as a seal). High pressure valve
    100% TYRE LIFE                                                             caps should always be used and replaced as
                80                         25% TYRE                            necessary.
                                           LIFE LOST
 % Tyre Life

                60

                40

                20
                                    80% INFLATION
                 0
                     120 100% INFLATION   80     70        60   50   40   30
                                    % Inflation Pressure

                                                                                                                                                                                      11

               110
Guide to tyre management and maintenance on heavy vehicles

     Tyre pressure maintenance is widely                 180° opposite to each other and fitting a
     neglected on the inner tyres of twin wheels.        good quality valve extension to the inner
     This is a major cause of accelerated wear           wheel will facilitate regular tyre pressure
     and premature tyre failure. Ensuring                maintenance.
     that the inner and outer valves are fitted

     RESPONSES TO UNDER-INFLATION

       0 - 10%            Examine for external damage before re-inflation
       under-inflation    Re-inflate as soon as possible

                          Examine for external damage before re-inflation
       10 - 20%
                          Re-inflate immediately
       under-inflation
                          Monitor for continuing deflation

                          Remove tyre from rim and inspect for possible internal damage
       20% +
                          Take extra care on re-inflation: increased risk of sidewall “zipper” failure
       under-inflation
                          Monitor for continuing deflation

12
RETRO-FIT TYRE PRESSURE                           BULGES
MONITORING SYSTEMS (TPMS)                         Sidewall undulations can result from normal
A wide range of products is available at          manufacturing processes or a satisfactory
increasingly competitive prices. Proven           repair. However, a bulge can indicate internal
benefits include a significant reduction in       separation or partial failure of the tyre
tyre-related breakdowns, longer tyre life and     structure. A bulge due to a repair will be
improved fuel consumption. Some systems           solid, feeling firm to hand pressure and will
will link to vehicle telematics allowing the      not deflect as would a bulge associated with
communication to the operating centre of          casing separation. If in doubt a qualified tyre
alerts highlighting issues to be addressed.       technician should be consulted.

AXLES FITTED WITH KINETIC                         OIL, PETROL, DIESEL
ENERGY RECOVERY SYSTEMS                           Many industrial chemicals and solvents,
Kinetic Energy Recovery Systems (KERS)            including oils, petrol and diesel, can damage
offer improved fuel economy by conserving         tyres. These contaminants should be removed
braking energy and releasing it as the vehicle    using plenty of water and a mild detergent.
accelerates. In this context the KERS axle        Severe contamination may render the tyre
contributes to driving the vehicle forward. As    unusable.
such, it should be fitted with a tyre suitable
for a drive axle. “Trailer use only”, “Trailer
use” and “FRT” tyres are not suitable for use     OBJECT TRAPPED BETWEEN
on KERS-equipped axles.                           TWINNED TYRES
                                                  Any object trapped between twinned tyres
                                                  should be removed. It may be necessary to
Other Tyre Conditions:                            deflate the tyres or dismount the outside
CUTS & TEARS                                      wheel in order to do so. Both tyres may have
                                                  been damaged and should be thoroughly
Cuts & tears could permit water to reach the
                                                  inspected by a competent tyre technician
casing or bracing plies, causing corrosion that
                                                  before re-entering service.
may weaken the structure of the tyre if the
exposure is prolonged. In addition to being
potentially illegal, such damage could render
the tyre unacceptable for retreading. Repair
in accordance with BS AU 159g:2013 should
be pursued as soon as possible.

                                                                                                    13
Guide to tyre management and maintenance on heavy vehicles

     AGEING                                           AGEING: APPLICABLE
     Tyres can deteriorate with age: this             REGULATIONS
     may show as cracking or crazing on the           From 1st February 2021 Construction and
     sidewall or in the grooves of the tread          Use Regulation 27 will not permit the use of
     pattern. Similar damage can be caused by         tyres in excess of 10 years of age on the front
     overheating resulting from under inflation or    steered axle(s) of heavy goods vehicles, buses
     overloading. In severe cases, either cause can   and coaches. It will also be a requirement for
     lead to separation of the inner components       all tyres on these vehicles to display a date
     of the tyre.                                     code. Detailed provisions are contained in
     Tyre ageing is not a function of the passage     the Regulations.
     of time alone but rather the cumulative          The date of manufacture of a new tyre
     exposure to adverse environmental and            can be determined from the DOT code
     operational factors. Prolonged exposure          marked on the sidewall. The final four digits
     to ozone or ultra-violet light can affect the    show the calendar week and the year of
     natural and synthetic rubbers used in tyres.     manufacture. The tyre in the photograph
     Tyre manufacturers incorporate additives         was manufactured in week 08 of 2020.
     to reduce this phenomenon. The flexing of        On retreaded tyres the most recent date
     the tyre in normal use helps the diffusion       of remanufacture is shown. Consult the
     of these additives to the surface of the tyre    remanufacturer for details of the relevant
     where they act against the adverse effects of    marking.
     exposure to ozone and ultra-violet light. This
     diffusion process is greatly reduced in tyres
     fitted to vehicles that are used infrequently.
     Consequently, such tyres are more
     susceptible to degradation caused by adverse
     environmental factors than tyres on vehicles
     that are used frequently. Spare wheels are a
     case in point.
     If a tyre is showing signs of ageing its
     condition should be assessed by a competent
     tyre technician. Some tyre manufacturers
     recommend that tyres over 10 years old
     should be withdrawn from service.

14
5. Tyre Repairs
It is vital that any repair is undertaken by     • Tyre filler should only be used for
a trained operative. All tyre repairs should       localised cosmetic repairs where there is
follow the recommendations contained               no penetration or ply damage. Tyres with
within BS AU 159g:2013.                            damage that extends to the reinforcement
                                                   cords should be assessed by a qualified
Prior to affecting a repair, the following
                                                   repair technician and, where appropriate,
important points should be borne in mind:
                                                   only repaired in accordance with BS AU
• External plugging (string repair) is for         159g:2013.
  short-term temporary repairs only, eg to
  get the vehicle into a position where it
  can be jacked safely. A string repair is not   MAJOR REPAIRS
  suitable to return the vehicle into normal
                                                 Heavy vehicle tyres with major repairs
  service.
                                                 conforming to the British Standard must be
• Temporary repairs should not be applied to     marked by the repair agent, radially in line
  sidewall damage.                               with each repair at a point just above the
                                                 area covered by the rim flange. The marking
• A permanent repair requires the removal
                                                 must be permanently legible with the
  of the tyre from the rim in order to allow
                                                 number of the British Standard, i.e. BS AU
  an internal examination by a competent
                                                 159g:2013, and with the repairer’s name or
  tyre technician and the application of
                                                 identification mark. The minimum height of
  suitable repair materials from the inside of
                                                 the characters must be 4mm.
  the tyre.
                                                 It is recommended that tyres that have been
• The insertion of a tube to affect a
                                                 subject to a major repair as defined in BS
  ‘repair’ to a minor penetration is not
                                                 AU 159g:2013 should be fitted to a rear axle
  recommended.
                                                 position only.
• Liquid tyre sealants are not considered to
  be a permanent repair in accordance with
  BS AU 159g:2013.

                                                                                                15
Guide to tyre management and maintenance on heavy vehicles

     6. Regrooving
     APPLICABLE REGULATIONS                                 the upper belts of the tyre, and to ensure
                                                            that an adequate layer of rubber is left to
     Construction and Use Regulations 24 and 27
                                                            protect them. Tyre manufactures supply
     apply. Only tyres identified on the sidewall as
                                                            specific instructions regarding the patterns
     regroovable may legally be regrooved. This
                                                            and procedures to follow in the regrooving
     applies to both new and retreaded tyres. It is
                                                            of tyre treads. These include recommended
     also a legal requirement that any regrooving
                                                            groove widths and the depth of rubber
     must follow the pattern specified by the
                                                            to remove from the base of the original
     manufacturer. If the tyre cords are exposed
                                                            grooves.
     as a result of regrooving the tyre is no longer
     legal and must be withdrawn from service.              Regrooving should normally be carried
                                                            out on the entire tread according to the
                                                            recommended pattern and procedure.
     BASIC PRINCIPLES                                       However, where a tyre has worn abnormally,
     The regrooving operation consists of cutting           it may be possible to regroove just that
     into the tread of a tyre a tread pattern               part of the worn tyre, provided a sufficient
     deeper than the original, so as to prolong the         portion of the original groove is visible
     tyre’s useful life. When regrooving, it is of          before regrooving. Clearly, this precludes
     fundamental importance to avoid exposing               further re-grooving later in the tyre’s life.

       Original Profile
             1   Bottom of tread pattern                5   Profile before regrooving
             2   Tread wear indicator                   6   Layer of under tread rubber
             3   Regroove depth indicator
             4   Layer of under tread rubber
                                                       Thickness of rubber         Thickness of rubber
                                                       to be regrooved             to be retained 2mm

                                 2
                                                                               6
                             1                                      5
                                 3
                        4

16
7. Retreading
Retreaded heavy vehicle tyres offered for         that retreaded tyres are no more likely to fail
sale in Europe must comply with UN ECE            in service than first life tyres.
Regulation 109. This ensures that retreaded
                                                  Although in all respects modern retreaded
tyres meet the same standard for structural
                                                  tyres are equivalent to new tyres, there is a
integrity under endurance testing as
                                                  long-standing industry convention generally
new tyres.
                                                  to not fit retreaded tyres to front steer axles,
Retreading involves the remanufacturing of        except in certain low speed applications.
a worn tyre casing to “as new” condition.         This was born out of historical prudence
In all cases it involves the replacement of       before the introduction of present-day
tread rubber and may include the renovation       non-destructive testing methods. Since tyres
of the shoulder and sidewalls. The safety,        cannot be retreaded indefinitely, there is also
performance and structural integrity of           the practical necessity to introduce new tyres
a retreaded tyre depend largely on the            into the retreading cycle.
condition of the original tyre casing. All tyre
                                                  Including retreaded tyres in an integrated
casings selected for retreading are subjected
                                                  tyre management programme offers
to extensive examination and non-destructive
                                                  improved lifecycle costs and greatly reduced
testing to establish the casing’s structural
                                                  environmental impact.
integrity and suitability for continued use.
Recent research by Highways England into
the source of roadside tyre debris concluded

                                                                                                     17
Guide to tyre management and maintenance on heavy vehicles

     8. Tyre Storage                                 10. Training
     Detailed guidance regarding the storage         Operators must ensure that they provide
     of tyres is contained in the ETRTO              sufficient training to enable their staff to
     recommendations.                                carry out competently the duties they are
                                                     assigned. A range of appropriate training
     Tyres should be kept in a cool, dry, and
                                                     courses will be necessary according to the
     moderately ventilated environment away
                                                     roles or duties concerned.
     from any possible contact with oil or
     hydrocarbon solvents or lubricants. They
     should be kept away from sources of heat
                                                     DRIVER TRAINING
     such as pipes or radiators and be protected
     from exposure to sunlight and strong            It is a duty of the driver of a PCV or LGV
     artificial lighting. Avoid storage near any     (Large Goods Vehicle) to ensure that the tyres
     electrical equipment which may produce          on the vehicle they will be driving are fit for
     sparks, such as arc welding equipment.          purpose and safe to use. Each driver must
                                                     carry out a thorough vehicle walk around
     Tyres should be stored in a relaxed condition
                                                     check before undertaking their journey /
     free from tension, compression or other
                                                     duty. The driver must be competent enough
     deformation, ideally arranged vertically.
                                                     to identify if a tyre fulfils legal requirements.
                                                     Driver induction training should include a
                                                     module detailing tyre inspection and defect
     9. Wheels                                       recognition and reporting procedures. This
                                                     training should be refreshed at least every 5
                                                     years.
     All the issues relating to the care and
     maintenance of wheels and correct wheel         Drivers and Operator licence holders are also
     nut re-torquing are covered comprehensively     reminded that the first use driver check forms
     in the IRTE / Logistics UK guide “Wheel         part of a preventive maintenance programme
     security” and BS AU 50‑2.7b:2017.               and is an essential part of Operator licence
                                                     obligations.

18
Regular checks and audits must be carried         guidelines and any other relevant policy
out by Transport Managers and / or                relating to wheels and tyres. Maintenance
supervisory staff to ensure that checks           facilities should have policies and guidelines
are thorough and effective. Appropriate           on clear display and have sufficient clean
training will be needed to deliver this           tools and work areas to enable effective
responsibility. Records of audits should          inspection and repairs to be carried out.
be kept as evidence – failure to have a
robust system in place will jeopardise your
Operator’s licence.                               TYRE TECHNICIANS
A first user check-list for tyres is available    It is now common practice for many PCV or
here. Tyre checks are also included in the        LGV Operators to use tyre manufacturers
DVSA video guidance for daily walkaround          or appointed agents to maintain their
checks on HGV and PSV.                            fleet tyres under a maintenance contract.
                                                  Operators have realised the benefits of
                                                  using an appointed tyre expert over recent
VEHICLE MAINTENANCE STAFF                         years. There are obvious benefits to road
                                                  worthiness compliance, safety, efficiency
Any person who undertakes vehicle
                                                  and not least, financial performance.
maintenance must be competently trained
to identify tyre irregularities and staff         If operators choose to maintain their
must be able to prevent premature tyre            own tyres, they must ensure that the
failures by identifying wear patterns and         tyre technician has adequate recognised
changes in vehicle characteristics. They          training, accreditation and experience
should have received formal training such         relevant to their particular fleet. Many tyre
as City & Guilds / NVQ / IMI / Irtec in vehicle   manufacturers offer training packages from
maintenance.                                      basic awareness to thorough accredited
                                                  technician status award.
Staff must also be aware of manufacturers’
/ operators’ tyre pressure maintenance

                                                                                                   19
Guide to tyre management and maintenance on heavy vehicles

     11. Acknowledgements
     This revised guide is the result of                      Standards Agency. Thanks are also due to
     collaboration between the British Tyre                   the Confederation of Passenger Transport,
     Manufacturers’ Association and the                       Logistics UK and the Road Haulage
     Imported Tyre Manufacturers’ Association                 Association for their useful contributions.
     with the support of the Driver and Vehicle

     12. Useful Contacts

     ORGANISATION                                         CONTACT                              PHONE
     Driver and Vehicle Standards Agency                  enquiries@dvsa.gov.uk                0300 123 9000
     British Tyre Manufacturers’ Association              Info@btmauk.com                      01787 226995
     Confederation of Passenger Transport                 operations@cpt-uk.org                020 7240 3131
     Imported Tyre Manufacturers Association              www.itma-europe.com                  08453 700145
     Logistics UK                                         enquiry@logistics.org.uk             0371 711 2222
     National Tyre Distributors Association               info@ntda.co.uk                      01296 482128
     Road Haulage Association                             www.rha.uk.net                       01274 863100
     Society of Operations Engineers/IRTE                 soe@soe.org.uk                       020 7630 1111
     Bridgestone Europe NV/SA (UK Branch)                 Bsuk.technical@bridgestone.eu        01926 488580
     Continental Tyre Group Ltd                           administrator.technical@conti.de     01788 566240
     Goodyear Tyres (UK) Ltd                              tyre.techuk@goodyear.com             08453 453453
     GiTi Tire (UK) Ltd                                   technical@eu.giti.com                01565 831910
     Hankook Tyre (UK) Ltd                                info@hankooktire.com                 01327 304100
     Michelin Tyre plc                                    business.michelin.co.uk              0845 366 1598

     Several of the professional bodies listed above offer training courses
     relevant to tyre management. In addition, many tyre manufacturers
     offer specialist training courses covering numerous aspects of tyre
     use and management.

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